<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>Java实现验证码demo</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
  <form action="<%= request.getContextPath()%>/servlet/LoginServlet">
     验证码：<input type="text" name="verifyCode"/>
   <img alt="验证码" id="imageCode" src="<%= request.getContextPath()%>/servlet/ImageServlet" />
   <a href="javascript:reloadCode();">看不清楚</a><br />
   <input type="submit" value="提交" />
  </form>
  </body>
  
  <script type="text/javascript">
  	function reloadCode() {
  		var time=new Date().getTime();
  		//“?d="+time”，通过向url中传递参数破坏了浏览器的缓存机制，使得刷新成功
		document.getElementById("imageCode").src="<%= request.getContextPath()%>/servlet/ImageServlet?d="+time;
	}
  </script>
</html>
